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Speed Of The Photorefractive Effect In A Batio3 Single Crystal, Stephen Ducharme, Jack Feinberg

Stephen Ducharme Publications

We present data on the speed of light-induced refractive index changes in a BaTiO₃ single crystal. The light-induced erasure rate of a refractive index grating is shown to depend on optical intensity as I ^x where x<1. The exponent x depends weakly on temperature and increases from 0.62±0.02 to 0.71±0.02 when the temperature is varied between 12 and 40 °C. The sublinear dependence of rate on intensity implies that higher optical intensity is required to achieve high-speed operation of BaTiO₃ devices than previously thought. The dark erasure rate has an anomolously strong temperature dependence; it increases by a factor of …